Avery heavy duty laser labels 63x38mm pack of 420 product overview avery heavy duty laser labels 63x38mm pack of 420 l7060 20 sometimes you need to label things in inconvenient places where issues such as weather can damage their integrity and lose salient information avery heavy duty labels are made out of tough polyester meaning that they can stay intact even in a warehouse or factory environment where they are liable to come into contact with machinery or heavy equipment these labels a